[Bug c++/105606] [12 Regression] std::pair with nested struct and NSDMI and -std=c++20

[mrjoel at lixil dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105606

--- Comment #4 from Joel Johnson <mrjoel at lixil dot net> ---
> Wait you didn't mention you needed -std=c++20 to get the failure.

Ah indeed, my apologies!

I'm unable to reproduce the Clang failure using -std=c++20, at least in a quick
godbolt check at https://godbolt.org/z/3W4xeYdWs.